Shears



March 17, 1931- U.-F. L. STEINDORFF ET AL 1,796,812

SHEARS Filed Oct. 26, 1925 2 Sheets-$heet l fig- 4 0,

/ 'WIUIJ M ZZZ Z11 HELLER I ATTORNE Y Patented Mar. 17, 1931 UNITED STATES PATENT OFFICE- ULRIGH F. L. STEINDOBFF AND HERBERT J. HELLER, OF NEW YORK, N. Y.

SHEARS Application filed. October 26, 1925. Serial No. 64,750.

This invention relates to shears and particularly to power driven shears.

The principal object of the invention is to provide a new and improved construction for a small compact power driven shears capable of cutting with equal facility, curved, as well as straight outlines. A further object is to provide a shears of the type referred to, of strong durable construction m having a minimum of operating parts and to entirely enclose substantially all of the moving parts in a housing adapted to contain a supply of lubricating oil, in which the moving parts are entirely or partially 15 immersed.

These and other objects will appear more fully from the following more detailed description and by reference to the accompanying drawings forming a part hereof, 20 and wherein Fig. 1 is a front elevation of a constructional example of a shears embody ing the principles of our invention; Fig. 2 is a side elevation of the structure shown in Fig. 1; Fig. 3 is a plan; Fig. 4 is a sec 25 tion on the line 44 of Fig. 1; Fig. 5 is a section on the line 5-5 of Fig. 4 and Fig. 6 is a section on the line 66 of Fig. 5. As shown in the drawings, we provide a main frame preferably constructed as a so metal casting and having a horizontally extending base portion 10 and a vertically extending standard 11. The base portion 10 is provided with a bearing surface 10 upon which a small electric motor 12 ,is adapted as to be secured. The standard 11 is bored out as indicated at 11 to provide a cupshaped. housing in which a reduction gearing is enclosed. Said reduction gearing comprises a pinion 13 and a co-operating 4o gear 14. The pinion 13 is secured to a shaft 15 rotatably mounted in a bearing 15, mounted in the vertical wall of the standard 11. The-stub shaft 15-is connected by means of the coupling 16 with the armature 45 shaft 17 of the motor 12. Seated within and covering the 0 en end of the cup shaped housing, 19. a com med cover and bearing plate 18 which is secured to the housing by form a fluid tight reservoir 20 in which the reduction gearing is mounted, it being understood that a gasket 21 may be employed for securing a tight joint between the cover plate and housing. The gear 14 is secured to a jack shaft 22 which is rotatably mounted in the ball bearings 23, 24, secured respectively within the cover plate 18 and the vertical wall of the standard 11, a small cover 24: being secured to the standard-11 to close the aperture in which the bearing 24. is

seated.

The jack shaft 22 projects outwardly beyond the cover plate 18 and bearing 23, and said projecting end is shaped to provide an eccentric 25 which is seated within a ball bearing 26, mounted in a movable blade carrier 27 The blade carrier 27 is slidable within a guide way formed by the front face of the cover plate 18 and the rear face of a combined stationary blade carrier and anvil 28, which is fixedly secured to the cover plate 18 by an suitable means, such as the bolts 29. Pro ected laterally from one side of the movable blade carrier 27 is a tail like extension 30, provided with a slot 31 adapted to engage over the flattened faces 32 of a pivot pin 33, said pivot pin being rotatably mounted in bearings formed in the vertical wall of the standard 11 and the stationary blade carrier 28. Projecting from the rear face of the combined stationary blade carrier and anvil 28 is a flange 34 which extends around and partially encloses the movable blade carrier, said flange serving to hold the rear guiding face of themember 28, properly spaced from the cover plate 18, and also serving to provide with said cover plate an oil reservoir or housing 35, in which the movable blade carrier and its bearin 26 are enclosed. A gasket 35 preferably 15 interposed between the fiange 34 and cover plate to provide a fluid tight joint. The flange 34 is interrupted to provide an opening at the top of the reservoir 35, through which an upwardly extendin projection of the movable carrier 27 pro ects, said projection having secured thereto the movable cutting blade 36. The movable cutting blade 36 c0- operates with a fixed blade 37, secured to and seated within a projecting arm 38 inte ral with the member 28.

t will be noted that the cutting edge of the movable blade 36 extends substantially horizontally, while the cutting edge of the stationary. blade extends upwardly from the rear edge of the movable. blade at an angle, the rear ends of the two cutting edges of the blades meeting in slightly overlapping relationship.

In order to'permit the shears to cut curved outlines, as well as straight cuts with equal facility, a pair of guiding surfaces 39, 40, are provided upon the stationary blade carrier 28 and its arm 38. Both of these curved guiding surfaces, as clearly shown in Fig. 3, begin at the rear meeting edges of the cut ting blades, the upper surface 40) curving towards the right in said figure, and the lower surface towards the left. To prevent distortion of the metal being cut, the projecting arm or anvil 38 is provided at the base of the curved iding surface 40 with a horizontally exten ing fiat surface 41, located substantially in alignment with the cutting edge of the movable blade 36. The curved guiding surface 39, as will be seen by referring to- Figs. 3 and 5 of the drawing, is formed at the inner end of a clear- 30 ance slot provided between the lower end of the anvil arm 38 and a straight portion 34* of the flange 34, said slot extending substantially in alignment with the cutting edge of the stationary blade 37 and terminating at its inner end at the rear meeting edges of the cutting blades.

The operation of the device is as follows: Rotation of the motor 12 will, through the action of the reduction gears 13, 14, cause 9 the jack shaft 22 to be rotated. The eccentric throw 25 of said shaft, combined with Y the pivotal anchorage of the movable blade carrier 27 upon the pivot pin 33 will produce a compound reciprocating movement of 45 the movable cutting blade 36, said blade moving inwardly towards the stationary blade 37 during its active or cutting stroke, and moving outwardly from the stationary blade during its downward or inactive 5 stroke. As the curved surface 39, 40 meet, as it were, in a point at the rear edges of the cutting blades, the material being out can be moved without restraint in a horizontal plane to cut sharply curved outlines. The

cutting of such curved outlines is facilitated by the very slight amount of cutting performed at each stroke of the shears, but as v the movable blade 27is operated at a very high speed by the electric motor 12, the cutting operation can be accomplished with great rapidity, inspite of the smalllength of material cutat each stroke. The waste material from a cutting operation is preferably directed through the slot adjacent to as the curved surface 39, while the work is passed over the supporting surface 41 adjacent to the curved surface 40. The downward inclination of the clearance slot, adjacent to the curved surface 39 and the alignment of this slot with the stationary blade 37, coupled with the provision of the horizontal supporting surface 41, and the small cutting stroke of the shears prevents the material from being curled up or otherwise distorted in the manner common to most shears.

It will be understood'that after the device is assembled and installed ready for operation, a supply of lubricating oil will be poured into the reservoir 35 through the opening provided for the upward extension of the movable blade carrier. The oil flowing into the reservoir 35 will pass through the openings in the cage of the ball bearing 23 into the reservoir 20, a suflicient amount of oil being poured into the'reservoirs until it reaches a level sufficiently high to insure lubrication of the ball bearings and jack shaft, but without permitting the oil to overflow through the opening at the upper end of the reservoir 35.

.It will further be understood that many changes, variations'and modifications may be made from the structural details of the constructional example herein disclosed, without departing from the spirit of our invention.

We claim:

1. In a power driven shears, a frame comprising a base and a standard, said standard being provided with a cup-shaped housing, a cover plate secured to said housing,

and defining therewith an oil reservoir, a combined anvil and stationary blade carrier secured to said cover plate and defining therewith a guide way, and a movable blade carrier mounted in said guide way.

2. In a power driven shears, a frame comprising a base and a standard, said standard being provided with a cup-shaped housing, a cover plate secured to said housing and defining therewith an oil reservoir, a combined anvil and stationary blade carrier secured to said cover plate and defining therewith a guide way, a movable blade carrier mounted in said guide way, a reduction gear mounted in said reservoir, and a jack shaft having an eccentric throw at one end thereof engaged within said movable blade carrier.

3. In a power driven shears, a frame comprising a base and a standard, said standard being provided with a cup-shaped housing, a cover plate secured to said housing, a combined anvil and stationary blade carrier secured to said cover plate and defining therewith a stationary guide way, a movable blade carrier mounted in said guide-way, a

jack shaft rotatably mounted in said standard and cover plate, said jack shaft havingan eccentric throw on one end thereof engaged within said movable blade carrier, a motor carried by said base and a reduction gearing between said motor and 'ack shaft. 4. In a power driven shears, a rame comprisinga base and a standard, said standard having a cup-shaped housing, a cover plate secured to said housing and forming therewith an oil reservoir, a combined anvil and stationary blade carrier secured to said coverplate, said blade carrier having a projecting flange and defining with said cover plate a second oil reservoir, and a reduction gear and a movable blade carrier substantially enclosed within said reservoirs.

5. In a power driven shears, a frame comprising a base and a standard, said standard having a cup-shaped housing, a cover plate secured to said housing and forming therewith an oil reservoir, a combined anvil and stationary blade carrier secured to said cover plate, said blade carrier having aprojecting flange and defining with said cover plate a second oil reservoir, a reduction gear enclosed within said first named reservoir and a movable blade carrier mounted within said second reservoir, and a jack shaft havingan eccentric throw engaged within said movable blade carrier, said cover plate hav- 'ing an aperture in which is mounted an anti-friction bearing for said ack shaft, and

- said bearing having through openings furnishing communication between said reservoirs.

6. In a power driven shears, a frame comprising a base and a standard, said standard having a cup-shaped housing, a cover late secured to said housing and forming t erewith an oil reservoir, a combined anvil and stationary blade carrier secured to said cover plate, said blade carrier having a projecting flange and defining with said cover .plate a second oil reservoir, said flange having an opening at the top thereof, a movable blade carrier mounted within said second reservoir, and having an extension projecting upwardly through said opening, a cutting blade secured to said extension, a jack shaft mounted in said standard and cover plate, and having an eccentric throw engaged within said movable blade carrier,-

and means for driving said movable blade including a reduction gear connected with said jack shaft and mounted within said first named oil reservoir.

'7. In a power driven shears, a frame comprising a base and a standard, a combined anvil and blade carrier member fixed to said standard, a stationary cutting blade secured to said member, a movable blade carrier mounted between said standard. and member, and a cutting blade, having its cutting edge inclined to the cutting edge of said stationary blade secured to said movable blade carrier for co-operation with said stationary blade, said member having a pair of guidin surfaces meeting at the rear edges of sai cutting blades and curving transversely from said edges in opposite directions.

8. In a power driven shears, a frame comprising a base and a standard, a combined anvil and blade carrier member fixed to said standard, a stationary cutting blade secured to said member, a movable blade carrier mounted between said standard and member, and a cutting blade, having its cutting edge inclined to the cutting edge of said stationary blade secured to said movable blade carrier for co-operation with said stationary blade, said member having a cooperating supporting surface for'each of said blades extending substantially in parallelism with the cutting edge of its respective blade and a curved guiding surface adjacent each supporting surface, said guiding and supporting sur aces meeting at the rear of said cutting edges and diverging therefrom, a motor mounted on said base, a jack shaft carried by said standard and a reduction gear connecting said motor and jack shaft.

9. In a power driven shears, a frame comprising a base and a standard, a pair of co- 0 crating vertically arranged cutter blades, t e upper blade being stationary and the lower of said blades being movably mounted on said standard, motor driven means for rapidly reciprocating said lower'blade rela tively to the upper blade to effect a cut and a member separable from said frame but rigidly secured thereto, havin projecting above said lower bla e and forming a combined anvil and stationary blade carrier.

10. In a power driven shears, a standard formed with a recess, a cover plate for said recess secured to said standard, a member mounted upon said cover plate in spaced parallel relation to form a guideway, an anvil carried by said member, a stationary blade fixed on said anvil, a movable blade, a carrier movably mounted in said guideway and carrying said movable blade, and mechanism located in part in said recess for actuating said movable blade carrier whereby said movable blade is operated relatively to said stationary blade to effect a cut.

11. In a power driven shears, a bracket formed with a recess and a pair of spaced a portion operating cutting blades, one carried by said movable blade carrier and the other by said stationary blade carrier, said cover plate when detached permitting ready removal of said movable carrier and said jack shaft.

12. In a shears, a shear head comprising a bracket, and an anvil detachably secured thereto, a movable cutting blade carried by said bracket, and a stationary cutting blade carried by said anvil, said anvil being provided with an upper work supporting and a lower work guidingsurface extending rearwardly of, and one on each side of, said cutting blades. r

13. In a shears, ashear head comprising a bracket, and an anvil detachably secured thereto, a movable cutting blade carried by said bracket, and a stationary cutting blade carried by said anvil, said anvil being provided with an upper work supportingand a lower work guiding surface extendin rearwardly of, and one on each side of, sai

cutting blades, and said bracket and anvil being constructed and arranged to provide freeclearance spaces rearwardly of said cutting blades and adjacent to said surfaces to permit the free passage of the work through said shears.

In testimony whereof we have hereunto set our hands.

ULRICH F. L. STEINDORFF.

HERBERT J. HELLER.

DISCLAIMER l,7 96,812.--mricb F. L. Steindozfl' and Herbert J. Heller, New York, N Y. Smuns. Patent dated March 17, 1931. Disclaimer filed October 19, 1940, by the aseignae, The Stanley Works. Hereb disdaims claim 12. of said Letters Patent.

[({flia'al Gazette November 26, 1.940.] 

